Role of thyroid surgery in the obstructive sleep apnea syndrome.

OBJECTIVES: To study the impact of thyroid surgery on obstructive sleep apnea syndrome (OSAS) evaluated by the apnea/hypopnea index (AHI) was studied. Secondary objectives were to evaluate the impact on the positional component of OSAS and to highlight possible predictors of improvement of OSAS after thyroidectomy. METHODS: Twenty-eight patients with OSAS are included in this monocentric study: they underwent total thyroidectomy (n = 26) or left loboisthmectomy. Postoperative assessment involves a nocturnal control polysomnography as of 60 days after surgery. RESULTS: The mean age at the time of surgery is 61.3 years (standard deviation ±7.3) and average body mass index is 29.6 kg/m2 (±7.3). Continuous positive airway pressure (CPAP) treatment is introduced preoperatively in 82% of patients. The statistical analysis shows a significant decrease of 33% in postoperative AHI for the total population (p = 0.001), 77% in patients under CPAP (p = 0.05), and 27% in patients without CPAP (p = 0.02). CPAP therapy could be released in four patients. Given the limited number of subjects studied, the surgery did not impact on the positional component of the OSAS. Statistical analysis failed to link a predictive factor to AHI reduction. CONCLUSIONS: We propose thyroid surgery as an alternative or as a complement to CPAP treatment for the patients with goitre: it allows a significant decrease in postoperative AHI, allowing adaptation of the CPAP treatment downward, or even a release in some cases. These results need to be confirmed on a larger series of patients in a prospective study with standardized criteria for polysomnography and multivariate analysis.

[Acoustic study of sustained vowels made by patients with recurrent nerve paralysis after thyroidectomy]. / Etude acoustique de voyelles soutenues produites par des patients présentant une paralysie récurrentielle après thyroïdectomie.

The objective of this work is to evaluate the consequences of thyroid surgery on the voice of patients suffering from recurrent paralysis. The consequences of the surgery are evaluated using a corpus of sustained vowels in order to identify the various disruptions that this procedure may produce. This research also looks for possible compensatory and/or readjustment strategies that can be used by a patient alone and with the help of speech therapy. Acoustic measurements considered are fundamental frequency (F0), Harmonics-to-Noise Ratio (HNR), and vowel space area. This is a longitudinal study, as all patients are recorded once a month during three months after surgery. Results reveal a modification of all parameters in the early recording stages. However, time and speech therapy contribute to obtaining expected values of the measured parameters, and thus to improvement of vocal quality.